800J
600J
100J
400J
Correct answer is D
Since the force is inclined at an angle 60o to the horizontal, the effective component of te force along the horizontal is given by F x cos 60o
= 100 x 0.5 = 50N.
∴ work done = F x cos 60 x displacement
= 50 x 8.0m
= 400.0J
Which of the following features is NOT a characteristic of natural radioactivity? ...
A magnet is moved through a coil of wire. The e.m.f. produced in the wire depends on ...
Melting ice cools an orange drink far better than the same mass of ice-cold water because ...
A galvanometer of resistance 20Ω is to be provided with a shunt that 110 of th...
The amplitude of a wave is the ...
The half-life of a radioactive substance is 2 seconds. Calculate the decay constant ...